Chimney cap construction



Dec. 31, 1963 c. w. ADELT CHIMNEY CAP CONSTRUCTION Filed June 15, 1962 2 Sheets-Sheet 1 FIG. 1.

INVENTOR. cweL m 4077 Dec. 31, 1963 c. w. ADELT CHIMNEY CAP CONSTRUCTION 2 Sheets-Sheet 2 Filed June 15, 1962 INVEN TOR.

m T m A 0W4 W W Y United States Patent 3,115,820 CHMNEY CAP CONSTRUCTIGN Carl W. Adelt, 450 River Road, Mays Landing, NJ. Filed lune 15, 1962, 'Ser. No. 202,858 '2 Claims. (Cl. 98-60) The present invention relates to a chimney cap construction.

An object of the present invention is to provide a chimney cap construction which lends itself for ready mounting upon the top of a chimney, and which, when so mounted, acts to mitigate the pollution of the surrounding atmosphere by the smoke and gases emitting from the chimney.

Another object of the present invention is to provide a chimney cap construction which, when mounted upon the top of a chimney, acts to prevent downdrafts and to dissipate the emitting smoke and gases high above the surrounding atmosphere.

A further object of the present invention is to provide a chimney cap construction which is adapted for mounting upon any chimney, and which is commercially feasible and highly efiicient in action.

Other objects and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings, in which:

FIGURE 1 is a plan view of the chimney cap construction according to the present invention in position upon the top of a chimney;

FIGURE 2 is a side view of the assembly of FIGURE 1 showing the internal construction of the chimney cap construction;

FIGURE 3 is a perspective view of the chimney cap construction of the present invention in position upon the top of a chimney;

FIGURE 4 is a sectional view taken on the line 4-4 of FIGURE 1;

FIGURE 5 is a sectional view taken on the line 5-5 of FIGURE 1;

FIGURE 6 is an elevational view of the shell prior to the mounting of the vanes thereon;

FIGURE 7 is a partial elevational view of the shell of FIGURE 6 showing the vane-forming member in the process of being mounted thereon.

FIGURE 8 is an elevational view of the shell after one of the vane-forming members has been mounted upon and fixedly secured thereto;

FIGURE 9 is an elevational sectional view, on a reduced scale, of a modified form of the chimney cap construction in position upon the top of a chimney.

Referring to the drawings, the numeral 10 designates an elongated open-ended frusto-conical shell havingthe larger end of an area to surround an opening in the top of a chimney, the shell being adapted to be mounted in an upright direction upon the top of the chimney so that the larger end surrounds the opening in the chimney and is fixedly supported upon the top of the chimney with the smaller end vertically spaced above the top of the chimney. The shell 10, FIGURES l, 2, 3 and 4, is in an upright direction upon the top of the chimney 12, the larger open end surrounding the opening 14 in the top of the chimney 12 with the smaller end vertically spaced above the top of the chimney 12.

A plurality of vanes 18 arranged in spiral relation are disposed upon the internal face of the shell 10 so as to extend longitudinally of the shell and form internal spiral passages opening out of the smaller end of the shell. As shown in FIGURES 1, 2 and 4, the vanes 18 arranged in spiral relation are disposed upon the internal face of the shell 10 so as to extend longitudinally of the shell It) from a point 19, FIGURE 4, adjacent to and spaced from the larger end of the shell 19 to and out of and beyond the smaller end of the shell and form spiral passages extending from the point 19 and opening out of and above the smaller end of the shell 10.

Another plurality of vanes 20 arranged in spiral relation are disposed upon the external face of the shell 10 so as to extend longitudinally of the shell from the larger end to the smaller end thereof and form external spiral passages. As shown in FIGURES l, 2 and 4, the vanes 20 arranged in spiral relation are disposed upon the external face of the shell It) so as to extend longitudinally of the shell from the larger end to and out of and beyond the smaller end of the shell 10 and form external spiral passages opening out of and above the smaller end of the shell.

The vanes 18 and 20 are each formed by mounting a vane-forming member on the shell 10, the vane-forming member being shown in FIGURE 7, and comprising a bendable elongated strip 25 having a nose 26 projecting from one end thereof with a short leg 27 and a long leg 23 separated by a slit 29 extending inwardly from the free end of the short leg 27 to a point adjacent to and spaced from the nose 26, the long leg 28 having adjacent the free end a bendable lug 30. The vane-forming member is mounted upon the shell 14) by positioning the short leg 27 so that the free end is inwardly of and contiguous to the smaller end of the shell with the slit 29 in alignment With the smaller end of the shell, and then manipulating the member until the short leg 27 is wholly within the shell 1%, the connecting point of the slit 29 with the strip 25 in seating engagement with a complemental one of the plurality of slanted slots 31 extending inwardly from the smaller end of the shell, and the long leg 28 ex tending downwardly along the exterior face of the shell 10, with the lug 3t) and free end of the long leg 28 adjacent the larger end of the shell 10, whereupon the short leg 27 is bent to its spiral shape and welded to the inner face of the shell 10, the long leg 28 then bent to its spiral shape, followed by suitably bending the lug 30 and inserting it into a complemental one of the plurality of slanted slots 31 extending inwardly from the larger end of the shell 19, followed by turning the lug 30 against the inner face of the shell 10. This mounting results in the shell 16 having the internal and external vane construction as shown in FIGURE 8, in which construction the short leg 27 and the adjacent portion of the strip 25 and nose 26 form an internal vane 18 on the shell 10, and the long leg 28 and the adjacent portion of the strip 25 and nose 26 form an external vane 20 on the shell 10.

A frusto-conical open-ended tube 35 of the same internal area as that of the shell 10 is superimposed upon the shell 10 so that it surrounds the shell and engages the external vanes 20 with the larger end adjacent to and spaced above the larger end of the shell 10, the smaller end spaced above the smaller end of the shell 10, and the portion adjacent the smaller end of the tube enclosing the parts of the vanes projecting beyond the smaller end of the shell 10. The tube 35' with the external face vanes 24) of the shell 10 form a plurality of spiral passageways between the shell 19 and the tube 35 which extend from the smaller end of the tube 35 and open out of the larger end of the tube 35 and exteriorly of the shell 10.

In operation of the thus-described chimney top construction, the internal spiral passages on the shell 10 impart a swirling motion to the emitting smoke and gases, and the air which is drawn upwardly through the spiral passages between the shell 10 and the tube 35 imparts an upwardly-directed pull upon the emitting smoke and gases, resulting in the formation of a dense swirling column which is discharged from the chimney top construction high above the surrounding atmosphere.

Should a gust of Wind from directly above the chimney on which the chimney top construction of this invention is mounted impinge upon the chimney top construction, a downdraft will be exerted upon the emitting smoke and gases, resulting in the smoke and gases being forced upwardly and out of the chimney top construction with part of the smoke and gases being conveyed through and discharged from the spiral passageways between the shell and the tube 35.

Any rainwater which enters the chimney top construction is conveyed along the vanes 18 and is discharged therefrom onto the portion of the inclined floor 38 provided on the top of the chimney from which it is discharged to the exterior through a runway 39.

Reverting to FIGURE 9, this construction differs over the above-described chimney top construction only in that the tube 35 is provided with external vanes 4-0 and internal vanes 41. These vanes are obtained in the same manner as the internal and external vanes 13 and by the use of the vane-forming member above-described in connection with the shell 1%. The internal vanes 4-1 provide spiral internal passages which supplement the action of the spiral internal passages provided by the internal vanes 18, and the external vanes 40 provide external spiral passages which convey air upwardly or downwardly therealong depending upon the direction of the air draft.

The thus described chimney construction lends itself for use in large stack installations, as well as in smaller installations such as homes or dwellings. Also, once installed, it very satisfactorily handles the dissipation of the emitting smoke and gases automatically. In addition, such construction replaces the annular ring with its operator controlled means for by-passing gases through the ring during heavy atmospheric pressure which is usually mounted on the stacks of large installations.

What is claimed is:

1. A chimney cap construction comprising an elongated open-ended frusto-conical shell having a larger end of an area to surround an opening in the top of a chimney, said shell being adapted to be mounted in an upright direction upon the top of the chimney so that the larger end surrounds the opening in the chimney and is fixedly supported upon the top of the chimney with the smaller end vertically spaced above the top of the chimney, a first plurality of vanes arranged in spiral relation disposed upon the internal face of said shell so as to extend longitudinally of said shell and forming internal spiral passages opening out of the smaller end of said shell, a second plurality of vanes arranged in spiral relation disposed upon the internal face of said shell so as to extend longitudinally of said shell from the larger end to the smaller end thereof and forming external spiral passages, a frusto-conical open-ended tube of the same internal area as that of said shell, said tube being superimposed upon said shell so that it surrounds said shell and engages said external face vanes with the larger end adjacent to and spaced above the larger end of said shell and the smaller end spaced above the smaller end of said shell, said tube and said external face vanes forming a plurality of spiral passageways between said shell and tube and extending from the smaller end of said tube and opening out of the larger end of said tube and exteriorly of said shell, and a third plurality of vanes arranged in spiral relation disposed upon the external face of said tube so as to extend longitudinally of said tube from the larger end to and out of and beyond the smaller end of said tube and forming external spiral passages on said tube.

2. A chimney cap construction comprising an elongated open-ended frusto-conical shell having a larger end of an area to surround an opening in the top of a chimney, said shell being adapted to be mounted in an upright direction upon the top of the chimney so that the larger end surrounds the opening in the chimney and is fixedly supported upon the top of the chimney with the smaller end vertically spaced above the top of the chimney, a first plurality of vanes arranged in spiral relation disposed upon the internal face of said shell so as to extend longitudinally of said shell from a point adjacent to and spaced from the larger end of said shell to and out of and beyond the smaller end of said shell and forming internal spiral passages extending from said point and opening out of and above the smaller end of said shell, a second plurality of vanes arranged in spiral relation disposed upon the external face of said shell so as to extend longitudinally of said shell from the larger end to and out of and beyond the smaller end of said shell and forming external spiral passages opening out of and above the smaller end of said shell, 21 frusto-conical open-ended tube of the same internal area as that of said shell, said tube being superimposed upon said shell so that it surrounds said shell and engages said external face vanes with the larger end adjacent to and spaced above the larger end of said shell, the smaller end spaced above the smaller end of said shell, and the portion adjacent the smaller end of said tube enclosing the parts of the vanes projecting beyond the smaller end of said shell, the tube and external face vanes forming a plurality of spiral passageways between said shell and tube and extending from the smaller end of said tube and opening out of the larger end of said tube and exteriorly of said shell, and a third plurality of vanes arranged in spiral relation disposed upon the external face of said tube so as to extend longitudinally of said tube from the larger end to and out of and beyond the smaller end of said tube and forming external spiral passages on said tube.

References Cited in the file of this patent UNITED STATES PATENTS 1,849,812 Spencer Mar. 15, 1932 2,100,801 Green Nov. 30, 1937 FOREIGN PATENTS 3,198 Great Britain 1893 

1. A CHIMNEY CAP CONSTRUCTION COMPRISING AN ELONGATED OPEN-ENDED FRUSTO-CONICAL SHELL HAVING A LARGER END OF AN AREA TO SURROUND AN OPENING IN THE TOP OF A CHIMNEY, SAID SHELL BEING ADAPTED TO BE MOUNTED IN AN UPRIGHT DIRECTION UPON THE TOP OF THE CHIMNEY SO THAT THE LARGER END SURROUNDS THE OPENING IN THE CHIMNEY AND IS FIXEDLY SUPPORTED UPON THE TOP OF THE CHIMNEY WITH THE SMALLER END VERTICALLY SPACED ABOVE THE TOP OF THE CHIMNEY, A FIRST PLURALITY OF VANES ARRANGED IN SPIRAL RELATION DISPOSED UPON THE INTERNAL FACE OF SAID SHELL SO AS TO EXTEND LONGITUDINALLY OF SAID SHELL AND FORMING INTERNAL SPIRAL PASSAGES OPENING OUT OF THE SMALLER END OF SAID SHELL, A SECOND PLURALITY OF VANES ARRANGED IN SPIRAL RELATION DISPOSED UPON THE INTERNAL FACE OF SAID SHELL SO AS TO EXTEND LONGITUDINALLY OF SAID SHELL FROM THE LARGER END TO THE SMALLER END THEREOF AND FORMING EXTERNAL SPIRAL PASSAGES, A FRUSTO-CONICAL OPEN-ENDED TUBE OF THE SAME INTERNAL AREA AS THAT OF SAID SHELL, SAID TUBE BEING SUPERIMPOSED UPON SAID SHELL SO THAT IT SURROUNDS SAID SHELL AND ENGAGES SAID EXTERNAL FACE VANES WITH THE LARGER END ADJACENT TO AND SPACED ABOVE THE LARGER END OF SAID SHELL AND THE SMALLER END SPACED ABOVE THE SMALLER END OF SAID SHELL, SAID TUBE AND SAID EXTERNAL FACE VANES FORMING A PLURALITY OF SPIRAL PASSAGEWAYS BETWEEN SAID SHELL AND TUBE AND EXTENDING FROM THE SMALLER END OF SAID TUBE AND OPENING OUT OF THE LARGER END OF SAID TUBE AND EXTERIORLY OF SAID SHELL, AND A THIRD PLURALITY OF VANES ARRANGED IN SPIRAL RELATION DISPOSED UPON THE EXTERNAL FACE OF SAID TUBE SO AS TO EXTEND LONGITUDINALLY OF SAID TUBE FROM THE LARGER END TO AND OUT OF AND BEYOND THE SMALLER END OF SAID TUBE AND FORMING EXTERNAL SPIRAL PASSAGES ON SAID TUBE. 